jQuery
在本站前面有文章介绍了如何实现发表微博说说:PHP+Mysql+jQuery实现发布微博程序--jQuery篇,本例将基于其数据库结构,用动态的方式展示发表的说说信息。查看示例:DEMO
XHTML复制代码 代码如下:
上述HTML结构由N个.saylist构成,用于展示用户的评论信息,当然在本例中,将由PHP负责生成这段XHTML代码。
CSS
复制代码 代码如下:
#demo{width:400px; height:80px; margin:80px auto; border-bottom:1px dotted #d3d3d3}
.saylist{margin:8px auto; height:80px; padding:4px 0;}
.saylist img{float:left; width:50px; margin:4px}
.saytxt{float:right; width:320px; overflow:hidden}
.saytxt p{line-height:18px}
.saytxt p strong{margin-right:6px}
.saytxt p span{color:#999}
.say{margin-top:3px; font-size:14px; font-weight:bold}
使用上述CSS渲染HTML外观,当然你也可以自己定制你喜欢的外观样式。
PHP
在function.php中有两个函数,formatSay()用来输出用户评论列表,即输出上文中的HTML。
复制代码 代码如下:
function formatSay($say,$dt,$uid){
$say=htmlspecialchars(stripslashes($say));
return'
';
}
时间轴函数tranTime()将时间转换成如“1小时前”的格式,详情可阅读本站文章:PHP实现时间轴函数
复制代码 代码如下:
function tranTime($stime) {
$rtime = date("m-d H:i",$stime);
$htime = date("H:i",$stime);
$day_time = date("j",$stime);
$today=date("j",time());
$ds = $today - $day_time;
$time = time() - $stime;
if ($time $str = '刚刚';
}
elseif ($time $min = floor($time/60);
$str = $min.'分钟前';
}
elseif ($time $h = floor($time/(60*60));
$str = $h.'小时前 '.$htime;
if($ds==1)
$str = '昨天 '.$rtime;
}
elseif ($time $str = '昨天 '.$rtime;
if($ds==2)
$str = '前天 '.$rtime;
}elseif($time $str = '前天 '.$rtime;
if($ds>2)
$str = $rtime;
}
else {
$str = $rtime;
}
return $str;
}
然后在index.php中调用funciton.php,并连接MySQL数据库输出评论列表。
复制代码 代码如下:
require_once('connect.php'); //连接数据库文件
require_once('function.php'); //函数文件
$query=mysql_query("select * from say order by id desc limit 0,15");
while ($row=mysql_fetch_array($query)) {
$sayList.=formatSay($row[content],$row[addtime],$row[userid]);
}
在div#demo中输出评论列表。
复制代码 代码如下:
这样一来,运行index.php会出现一个列表,我们只需要一条一条展示,下面就需要jQuery来办了。
jQuery
复制代码 代码如下:
$(function(){
//除了显示第一个saylist,其他的都隐藏
$(".saylist").hide().eq(0).show();
//自循环函数,循环展示信息
(function showNextSay(){
//每条信息展示7.5秒
$(".saylist:visible").delay(7500).fadeOut("slow",function(){
$(this).appendTo("#demo");
//展示下一条
$(".saylist:first").fadeIn("slow",function(){
//再次调用函数
showNextSay();
});
});
})();
});

PHP remains a powerful and widely used tool in modern programming, especially in the field of web development. 1) PHP is easy to use and seamlessly integrated with databases, and is the first choice for many developers. 2) It supports dynamic content generation and object-oriented programming, suitable for quickly creating and maintaining websites. 3) PHP's performance can be improved by caching and optimizing database queries, and its extensive community and rich ecosystem make it still important in today's technology stack.

In PHP, weak references are implemented through the WeakReference class and will not prevent the garbage collector from reclaiming objects. Weak references are suitable for scenarios such as caching systems and event listeners. It should be noted that it cannot guarantee the survival of objects and that garbage collection may be delayed.

The \_\_invoke method allows objects to be called like functions. 1. Define the \_\_invoke method so that the object can be called. 2. When using the $obj(...) syntax, PHP will execute the \_\_invoke method. 3. Suitable for scenarios such as logging and calculator, improving code flexibility and readability.

Fibers was introduced in PHP8.1, improving concurrent processing capabilities. 1) Fibers is a lightweight concurrency model similar to coroutines. 2) They allow developers to manually control the execution flow of tasks and are suitable for handling I/O-intensive tasks. 3) Using Fibers can write more efficient and responsive code.

The PHP community provides rich resources and support to help developers grow. 1) Resources include official documentation, tutorials, blogs and open source projects such as Laravel and Symfony. 2) Support can be obtained through StackOverflow, Reddit and Slack channels. 3) Development trends can be learned by following RFC. 4) Integration into the community can be achieved through active participation, contribution to code and learning sharing.

PHP and Python each have their own advantages, and the choice should be based on project requirements. 1.PHP is suitable for web development, with simple syntax and high execution efficiency. 2. Python is suitable for data science and machine learning, with concise syntax and rich libraries.

PHP is not dying, but constantly adapting and evolving. 1) PHP has undergone multiple version iterations since 1994 to adapt to new technology trends. 2) It is currently widely used in e-commerce, content management systems and other fields. 3) PHP8 introduces JIT compiler and other functions to improve performance and modernization. 4) Use OPcache and follow PSR-12 standards to optimize performance and code quality.

The future of PHP will be achieved by adapting to new technology trends and introducing innovative features: 1) Adapting to cloud computing, containerization and microservice architectures, supporting Docker and Kubernetes; 2) introducing JIT compilers and enumeration types to improve performance and data processing efficiency; 3) Continuously optimize performance and promote best practices.


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